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UNITED STATES-PATENT OFFICE.

SPENCER M. CLARK, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO ADOLPHUS S. SOLOMONS, OF SAME PLACE.

SELF -CANCELING POSTAL AND REVENUE STAMP.

Specification forming part of Letters Patent N 0. 98,031, dated December 21, 1869; antedated June 21, 1869.

To all whom it may concern:

Beit known that I, SPENCER M. CLARK, of Washington city, in the District of Columbia, haveinvented a new and useful Self-Ganceling Postal and Revenue Stamp, of which the following is a specification.

The nature of my invention consists in the production of a postal or revenue stamp, composed of two layers, one of which is perforated, the two being united and printed on the perforated side and gummed on the imperforate, so that when the stamp thus made is aflixed to paper or other material the two layers shall separate, or the imperforate layer breakin the part thereof uncovered by the perforate layer in any attempt at removing the stamp from the surface to which it is'attached.

In manufacturing my improved stamps I first punch one or more holes in the sheet of paper which shall constitute the outer layer of the stamp. I then cover this perforated paper with a second imperforate sheet, and

unite the two by means of a suitable adhesive the proper design, which is imprinted upon the perforated side thereof in such manner as to extend over and include therein some portion of the inner or imperforate layer disclosed by the perforations in the outer layer.

When the stamp has been duly printed, the imperforate layer or under side thereof is coated with gum, in the ordinary manner, so that it may be made to adhere to any desired surface.

A number of subjects may be imprinted, as usual, upon one large sheet prepared for the purpose, as herein set forth, and the finished stamps be afterward separated, in the customary manner.

I claim as my invention- A postal or revenue stamp composed of two layers, one of which is perforated, the two being united and printed on the perforate side, and guinmed on the imperforate side, substantial ly in the manner and for the purpose herein set forth.

S. M. CLARK. In presence of-' DAVID A. BURR, A. A. BROOKE. 

